Telephone



(No Model.)

A.v GARTNER. TELEPHONE.

No. 669,618. Patented oct. 6, 1696.

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UNITED STATES PATENT OFFICE.

ALFRED GARTNER, OF NEWARK, NEV JERSEY, ASSIGNOR TO ROBERT BAKER AND JOHNFILMER, OF BROOKLYN, AND EDGAR L. RYDER,

OF SING SING, NEW YORK.

-TELEPHONE.

SPECIFICATION forming' part 0f Letters Patent N0. 569,018, dated October6,v 1896. Application filed February 15, 1896. Serial No. 579,411, (Nomodel.)

To @ZZ whom t may concer/1,:

Be it known that I, ALFRED GAETNER, a citizen of the United States,residing in Newark, Essex county, and State of New Jersey, have inventedcertain new and useful Improvements in Telephones; and I do hereby'declare the following to be a full, clear, and

exact description of the invention, such as will enable others skilledin the art to which it appertains to` make and use the same, referencebeing had to the accompanying drawings, and to letters of referencemarked thereon, which form a part of this specilication.

The object of my invention is to provide a telephone-receiver in whichthe bearing-sur-y faces for the diaphragm are greatly reduced, thelatter can vibrate more freely, and the transmitted sounds or words canthus be heard very clear and distinct.

The invention consists in the improved telephone-receiver, thebearing-surfaces for the diaphragm, and in the combination andarrangement of the various parts thereof, substantially as will behereinafter more fully described and claimed. p

In the accompanying drawings, in which like letters of referenceindicate corresponding parts in the two figures, Figure 1 is asideelevation of aA telephone-receiver provided with my improvement withcertain portions shown in section; and Fig. 2 a top plan view of Fig. l,the top piece and the diaphragm being removed.

The telephone-receiver A is made in two sections ct and b, securedtogether by a screw thread connection c in the usual manner. The sectionct is provided at its upper portion with an annular groove or channel e,in which are arranged a series of balls f of a size so as to fit snuglyinto and yet to project over the crest or top fi of the inner wall ofthe said channel e.

The section b, penetrated by the central opening cZ,-is provided on itsinner portion with an annular curved flange h, which is of a diametersubstantially equal to the diameter of the channel e. The diaphragm gisarranged between the sections a and b and is held in position by thesaid balls f and the curved annular ange h, respectively. By thisarrangement the bearing-surfaces for the diaphragm are considerablyreduced, and the latter is thus allowed a greater and easier vibration,whereby the sounds or words transmitted can be heard more distinctlythan in other phones.

I do not intend to limit myself to the preoise construction shown anddescribed, as various alterations can bemade without changing the scopeof my invention; but

What I claim as new, and desire to secure by Letters Patent, is-

l. The combination with the telephone-receiver and its diaphragm, of aseries of balls arranged in the receiver and forming an annular bearingfor one side of the diaphragm, and an annular curved flange alsoarranged in said receiver and forming the bearing for the other side ofsaid diaphragm, substantially as and for the purposes described.

2. The combination with the telephone-receiver and its diaphragm, of anannular groove or channel arranged in said receiver, a series of ballsin said channel and adapted to form the bearing for one side of thediaphragm, and an annular curved ange, of a diameter equal to thediameter of the channel, also arranged in said receiver and adapted toform the bearing-surface for the other side of said diaphragm,substantially as and for the purposes described.

In testimony that I claim the foregoing I have hereunto set my hand this8th day of February, 1896A ALFRED GARTNEE.

Witnesses:

DUNCAN M. ROBERTSON, BENJAMIN OARLEY.

